Racquet weighs about 20-23 pounds with a large frame. He always seems hungry and wants to eat. He has a very sensitive tummy so I feed him 1/3 cup of food three times a day. Plus he get a bully stick to chew on daily plus a few chicken treats during the day.
I don't have a specific answer for you, but it really depends on the nutritional content and the amount of energy he uses each day. Has your vet taught you how to do a rib check? If he isn't too ribby (my new word), then he's getting enough food.
Brady is just under 20 lbs. I feed him 2x's a day. He gets 1/3 cup of food with some boiled chicken mixed in. He also gets some chicken jerky and other treats throughout the day (my husband is terrible about giving too many treats). Both of my boys would eat anything you put in their sight!
My guys are all on the big size, between 15 and 18.5 lbs. they all get fed two times a day, about a full cup total of WD (which is vet perscribed weight control food) Lily has lost 2 lbs in the last year, which was intentional, but Logan just keep growing!! He is so tall that I actually feed him a bit more than the girls, as he is so active. He still looks skinny, but runs it off! My vet recommended the weight control food once Lily hit 18 lbs. I think you vet would be the best one to say if he is "getting enough"
My boys are both around 15-16lbs. I give them 1/4c dry Evo, twice a day. I mix in a thin slice of chicken breast. They also get a little dehydrated chicken as treats and a spiral bully stick about every other day. I wasn't sure this was enough, but they rarely go for there dry kibble I leave out. The only time they ate the free feed kibble was when my dog sitter was staying here with them. The difference was, she was walking them twice as much as normal.
you know, I have the same problem with Cash ---he too is about 23 lbs, but I can't feel his ribs with ease. And he is always hungry!!! I feel cruel, but he is not losing any weight. so he is apparently getting enough. I feed him about 350 calories a day. I have a consult planned with a nutritionist, if I learn anything I will share.
Every dog must be a little different just depending on how much they exercise and type of bone structure and such. I'm surprised to hear those of you with larger Hav's than mine are feeding less food. Maybe it's the calorie counts or more snacks? I don't do daily snacks unless I'm using them for training. My boys are 13 and 16.5 pounds and eat a cup of kibble a day divided into two meals.